<?php

if (! defined('BASEPATH'))
    exit('No direct script access allowed');

/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package CodeIgniter
 * @author ExpressionEngine Dev Team
 * @copyright Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license http://codeigniter.com/user_guide/license.html
 * @link http://codeigniter.com
 * @since Version 1.0
 * @filesource
 *
 */
    
// ------------------------------------------------------------------------

/**
 * Pagination Class
 *
 * @package CodeIgniter
 * @subpackage Libraries
 * @category Pagination
 * @author ExpressionEngine Dev Team
 * @link http://codeigniter.com/user_guide/libraries/pagination.html
 */
class CI_Pagination
{

    var $base_url = '';
 // The page we are linking to
    var $prefix = '';
 // A custom prefix added to the path.
    var $suffix = '';
 // A custom suffix added to the path.
    var $total_rows = 0;
 // Total number of items (database results)
    var $per_page = 10;
 // Max number of items you want shown per page
    var $num_links = 2;
 // Number of "digit" links to show before/after the
                           // currently viewed page
    var $cur_page = 0;
 // The current page being viewed
    var $use_page_numbers = FALSE;
 // Use page number for segment instead of
                                   // offset
    var $first_link = '&lsaquo; First';

    var $next_link = '&gt;';

    var $prev_link = '&lt;';

    var $last_link = 'Last &rsaquo;';

    var $uri_segment = 3;

    var $full_tag_open = '';

    var $full_tag_close = '';

    var $first_tag_open = '';

    var $first_tag_close = '&nbsp;';

    var $last_tag_open = '&nbsp;';

    var $last_tag_close = '';

    var $first_url = '';
 // Alternative URL for the First Page.
    var $cur_tag_open = '&nbsp;<strong>';

    var $cur_tag_close = '</strong>';

    var $next_tag_open = '&nbsp;';

    var $next_tag_close = '&nbsp;';

    var $prev_tag_open = '&nbsp;';

    var $prev_tag_close = '';

    var $num_tag_open = '&nbsp;';

    var $num_tag_close = '';

    var $page_query_string = FALSE;

    var $query_string_segment = 'per_page';

    var $display_pages = TRUE;

    var $anchor_class = '';

    /**
     * Constructor
     *
     * @access public
     * @param
     *            array initialization parameters
     */
    public function __construct ($params = array())
    {
        if (count($params) > 0) {
            $this->initialize($params);
        }
        
        if ($this->anchor_class != '') {
            $this->anchor_class = 'class="' . $this->anchor_class . '" ';
        }
        
        log_message('debug', "Pagination Class Initialized");
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Initialize Preferences
     *
     * @access public
     * @param
     *            array initialization parameters
     * @return void
     */
    function initialize ($params = array())
    {
        if (count($params) > 0) {
            foreach ($params as $key => $val) {
                if (isset($this->$key)) {
                    $this->$key = $val;
                }
            }
        }
    }
    
    // --------------------------------------------------------------------
    
    /**
     * Generate the pagination links
     *
     * @access public
     * @return string
     */
    function create_links ()
    {
        // If our item count or per-page total is zero there is no need to
        // continue.
        if ($this->total_rows == 0 or $this->per_page == 0) {
            return '';
        }
        
        // Calculate the total number of pages
        $num_pages = ceil($this->total_rows / $this->per_page);
        
        // Is there only one page? Hm... nothing more to do here then.
        if ($num_pages == 1) {
            return '';
        }
        
        // Set the base page index for starting page number
        if ($this->use_page_numbers) {
            $base_page = 1;
        } else {
            $base_page = 0;
        }
        
        // Determine the current page number.
        $CI = & get_instance();
        
        if ($CI->config->item('enable_query_strings') === TRUE or
                 $this->page_query_string === TRUE) {
            if ($CI->input->get($this->query_string_segment) != $base_page) {
                $this->cur_page = $CI->input->get($this->query_string_segment);
                
                // Prep the current page - no funny business!
                $this->cur_page = (int) $this->cur_page;
            }
        } else {
            if ($CI->uri->segment($this->uri_segment) != $base_page) {
                $this->cur_page = $CI->uri->segment($this->uri_segment);
                
                // Prep the current page - no funny business!
                $this->cur_page = (int) $this->cur_page;
            }
        }
        
        // Set current page to 1 if using page numbers instead of offset
        if ($this->use_page_numbers and $this->cur_page == 0) {
            $this->cur_page = $base_page;
        }
        
        $this->num_links = (int) $this->num_links;
        
        if ($this->num_links < 1) {
            show_error('Your number of links must be a positive number.');
        }
        
        if (! is_numeric($this->cur_page)) {
            $this->cur_page = $base_page;
        }
        
        // Is the page number beyond the result range?
        // If so we show the last page
        if ($this->use_page_numbers) {
            if ($this->cur_page > $num_pages) {
                $this->cur_page = $num_pages;
            }
        } else {
            if ($this->cur_page > $this->total_rows) {
                $this->cur_page = ($num_pages - 1) * $this->per_page;
            }
        }
        
        $uri_page_number = $this->cur_page;
        
        if (! $this->use_page_numbers) {
            $this->cur_page = floor(($this->cur_page / $this->per_page) + 1);
        }
        
        // Calculate the start and end numbers. These determine
        // which number to start and end the digit links with
        $start = (($this->cur_page - $this->num_links) > 0) ? $this->cur_page -
                 ($this->num_links - 1) : 1;
        $end = (($this->cur_page + $this->num_links) < $num_pages) ? $this->cur_page +
                 $this->num_links : $num_pages;
        
        // Is pagination being used over GET or POST? If get, add a per_page
        // query
        // string. If post, add a trailing slash to the base URL if needed
        if ($CI->config->item('enable_query_strings') === TRUE or
                 $this->page_query_string === TRUE) {
            $this->base_url = rtrim($this->base_url) . '&amp;' .
             $this->query_string_segment . '=';
} else {
    $this->base_url = rtrim($this->base_url, '/') . '/';
}

// And here we go...
$output = '';

// Render the "First" link
if ($this->first_link !== FALSE and $this->cur_page > ($this->num_links + 1)) {
    $first_url = ($this->first_url == '') ? $this->base_url : $this->first_url;
    $output .= $this->first_tag_open . '<a ' . $this->anchor_class . 'href="' .
             $first_url . '">' . $this->first_link . '</a>' .
             $this->first_tag_close;
}

// Render the "previous" link
if ($this->prev_link !== FALSE and $this->cur_page != 1) {
    if ($this->use_page_numbers) {
        $i = $uri_page_number - 1;
    } else {
        $i = $uri_page_number - $this->per_page;
    }
    
    if ($i == 0 && $this->first_url != '') {
        $output .= $this->prev_tag_open . '<a ' . $this->anchor_class . 'href="' .
                 $this->first_url . '">' . $this->prev_link . '</a>' .
                 $this->prev_tag_close;
    } else {
        $i = ($i == 0) ? '' : $this->prefix . $i . $this->suffix;
        $output .= $this->prev_tag_open . '<a ' . $this->anchor_class . 'href="' .
                 $this->base_url . $i . '">' . $this->prev_link . '</a>' .
                 $this->prev_tag_close;
    }
}

// Render the pages
if ($this->display_pages !== FALSE) {
    // Write the digit links
    for ($loop = $start - 1; $loop <= $end; $loop ++) {
        if ($this->use_page_numbers) {
            $i = $loop;
        } else {
            $i = ($loop * $this->per_page) - $this->per_page;
        }
        
        if ($i >= $base_page) {
            if ($this->cur_page == $loop) {
                $output .= $this->cur_tag_open . $loop . $this->cur_tag_close; // Current
                                                                           // page
            } else {
                $n = ($i == $base_page) ? '' : $i;
                
                if ($n == '' && $this->first_url != '') {
                    $output .= $this->num_tag_open . '<a ' . $this->anchor_class .
                             'href="' . $this->first_url . '">' . $loop . '</a>' .
                             $this->num_tag_close;
                } else {
                    $n = ($n == '') ? '' : $this->prefix . $n . $this->suffix;
                    
                    $output .= $this->num_tag_open . '<a ' . $this->anchor_class .
                             'href="' . $this->base_url . $n . '">' . $loop .
                             '</a>' . $this->num_tag_close;
                }
            }
        }
    }
}

// Render the "next" link
if ($this->next_link !== FALSE and $this->cur_page < $num_pages) {
    if ($this->use_page_numbers) {
        $i = $this->cur_page + 1;
    } else {
        $i = ($this->cur_page * $this->per_page);
    }
    
    $output .= $this->next_tag_open . '<a ' . $this->anchor_class . 'href="' .
             $this->base_url . $this->prefix . $i . $this->suffix . '">' .
             $this->next_link . '</a>' . $this->next_tag_close;
}

// Render the "Last" link
if ($this->last_link !== FALSE and
         ($this->cur_page + $this->num_links) < $num_pages) {
    if ($this->use_page_numbers) {
        $i = $num_pages;
    } else {
        $i = (($num_pages * $this->per_page) - $this->per_page);
    }
    $output .= $this->last_tag_open . '<a ' . $this->anchor_class . 'href="' .
             $this->base_url . $this->prefix . $i . $this->suffix . '">' .
             $this->last_link . '</a>' . $this->last_tag_close;
}

// Kill double slashes. Note: Sometimes we can end up with a double slash
// in the penultimate link so we'll kill all double slashes.
$output = preg_replace("#([^:])//+#", "\\1/", $output);

// Add the wrapper HTML if exists
$output = $this->full_tag_open . $output . $this->full_tag_close;

return $output;
}
}
// END Pagination Class

/* End of file Pagination.php */
/* Location: ./system/libraries/Pagination.php */